Bird 8730 Series Econoload RF Load Resistor
4
Calorimetry
Almost all the RF power in the load is transferred to the coolant as
heat. There is no heat transfer to the outer housing of the load,
leaving it at ambient temperature even at full power. The flow rate,
and the difference between the input and output coolant
temperatures, can be used to calculate the power dissipated in the
load with the following formula:
where
P = Power in kilowatts
k = 0.263 for temperature in °C, 0.146 for temp. in °F
T
out
= Water temperature at the output of the load
T
in
= Water temperature at the input to the load.
F = Water flow rate in gallons per minute
NOTE: This calculation is performed automatically in the Bird
6085 Calorimeter.
P = k
×
(T
out
– T
in
)
×
F
